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Finding the Fourth Proportional to 1,309.38, 1,961.45 and 789.10

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Solution

The fourth proportional to 1,309.38, 1,961.45 and 789.10 is: 1,182.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.38 : 1,961.45 = 789.10 : x
  2. Step 2: Convert to fraction form
    1,309.38/1,961.45 = 789.10/x
  3. Step 3: Cross multiply
    1,309.38x = 1,961.45 × 789.10
  4. Step 4: Simplify right side
    1,309.38x = 1,547,776.25
  5. Step 5: Solve for x
    x = 1,547,776.25/1,309.38
  6. Step 6: Final answer
    x = 1,182.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.